Fix objc generation for Bytes property and for hash methods with switch statements

[YufeiG]

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• Non-code related change (markdown/git settings etc)
• Code Change
• Example/Test Code Change

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[codecov]

Codecov Report

Merging #222 (bfe724e) into main (b4ef39a) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #222      +/-   ##
==========================================
- Coverage   51.72%   51.72%   -0.01%     
==========================================
  Files          37       37              
  Lines        8369     8370       +1     
  Branches     1786     1786              
==========================================
  Hits         4329     4329              
- Misses       3726     3727       +1     
  Partials      314      314              

Flag	Coverage Δ
unit	51.72% <0.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
stone/backends/obj_c_helpers.py	0.00% <ø> (ø)
stone/backends/obj_c_types.py	0.00% <0.00%> (ø)

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[rogebrd]

Few questions since I am not super familiar with the Obj C Language.

• Would this be a breaking change?
• Do we have tests that show what the generated outcome should be? If so can we update those?

[YufeiG]

• These are 2 bug fixes. The current behavior is wrong. Objective-C switch statements require 'break;' between cases or they are fall through by default. And for bytes, currently the code generated cannot compile, but because we don't have routes with bytes type this hasn't been an issue. Every time we've added such a property and the objc generator fails, we've changed the route property to string. With this change, bytes should generate now as a string.
• There doesn't seem to be any objc or swift stone generator tests. I can look at adding a suite of tests for these languages later. This diff specifically should go in asap because the fall through switch is causing crashes in our app.